Production of thin hot strips of high silicon bearing FeSi-strip using the integrated technology of thin slab casting and hot rolling

采用薄板坯连铸热轧一体化技术生产高硅硅铁薄带材

• 批准号: 255681924
• 负责人: Professor Dr.-Ing. Rudolf Kawalla
• 金额: --
• 依托单位: Institut für Metallformung
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/255681924?language=en
• 关键词: Production; thin; hot; strips; silicon

Within the first phase of the project, various hot rolling strategies weredeveloped for the production of a thin, 1 mm thick hot strip of the Fe-2,4 wt.-% Si alloy using the conventional hot rolling process withprevious reheating and the integrated thin slab casting technology.The interactions of the individual process steps and the influence ofthe hot strip on the magnetic properties could be demonstrated. Withboth methods of hot strip production, it is possible to roll different hotstrip structures and textures for hot strip thicknesses between 1 mmand 2.5 mm. The hot strip states like hardened, partially softened andsoftened could be realised. Significant differences in texture withmagnetically advantageous and unfavorable textures were foundacross the strip thickness. The hot rolling process was investigatedexperimentally and simulatively. For this purpose, the hardening andsoftening behavior was investigated experimentally and simulativelydescribed by semi-empirically and physically based models. For aholistic view of the production of non-grain-oriented electrical sheetsand of the continuous process modeling, the modeling of the materialflow and the microstructural development after hot forming is anessential component with the layer model developed at the IMF as thebasis. The influence of the hot strip on the structure of the finalannealed samples and on the magnetic properties was also analyzed.In the second phase, the simulation of the hot rolling process and themicrostructure development during hot rolling as well as theexperimental work will be continued. Aim is to define hot stripstructures for specific applications with defined magnetic properties,to produce them in a targeted manner and to derive applicationorientedhot rolling strategies. Therefore, in cooperation with the othersubprojects of the research group, using an alloy with a high Sicontent (2.8 wt.% Si) is planed. This makes it possible to investigatethe influence of the alloy on the production process, especially hotrolling, the material behavior during hot forming and the effects on themagnetic properties. Based on the findings of the first phase of theproject, a thin hot strip is produced with a favorable initial state for thecold rolling and for the magnetic properties by means of adaptationsof the rolling strategies, whereby the intended hot strip annealingoffers further possibilities of the microstructure setting. The alteredhardening and softening behavior of the alloy with high Si content willbe also taken into account. The submodels of the individual processstages are linked to one another in cooperation with the projectpartners with the aim of experimentally imaging the theoreticallyderived process parameters and producing a non-grain-orientedelectrical sheet adapted to the defined requirements of thedemonstrator.

在项目的第一阶段，开发了各种热轧策略，以生产1毫米厚的fe -2,4 wt.-% Si合金热轧带钢，使用传统的热轧工艺和先前的再加热和集成的薄板坯铸造技术。可以证明各个工艺步骤的相互作用和热带对磁性能的影响。使用这两种热带钢生产方法，可以轧制不同的热带钢结构和纹理，热带钢厚度在1毫米至2.5毫米之间。热带硬化、部分软化、软化等状态可以实现。磁性有利和不利的织构在条带厚度上存在显著差异。对热轧过程进行了实验和模拟研究。为此，通过半经验模型和基于物理的模型对其硬化和软化行为进行了实验和模拟研究。为了全面了解无晶粒取向电薄板的生产和连续过程建模，以IMF开发的层模型为基础，热成形后材料流动和微观组织发展的建模是必不可少的组成部分。分析了热带对退火后试样组织和磁性能的影响。在第二阶段，将继续进行热轧过程的模拟和热轧过程中微观组织的发展以及实验工作。目的是定义具有特定磁性的特定应用的热带结构，以有针对性的方式生产它们，并推导出面向应用的热轧策略。因此，与研究小组的其他子项目合作，计划使用高硅含量（2.8 wt.% Si）的合金。这使得研究合金对生产过程的影响，特别是控制，热成形过程中的材料行为以及对磁性能的影响成为可能。根据该项目第一阶段的研究结果，通过调整轧制策略，生产出具有有利于冷轧和磁性能的初始状态的薄热带钢，从而预期的热带钢退火为微观结构设置提供了进一步的可能性。高Si含量合金的硬化和软化行为也将被考虑在内。各个工艺阶段的子模型与项目合作伙伴相互关联，目的是对理论推导的工艺参数进行实验成像，并生产出符合演示器定义要求的非晶粒定向电片。